Pencil



' panying drawings.

Patented May 24, 1927.

UNITED STATES P ENT O JULIUS SWANBERG,

or CHICAGO, nninorsgasslenon, BY MESNE ASSIGNMENTS, T planar cnnntron, or cnrcaeo, rumors.

f'ENQIIa A Application filed.- April 2,

This invention relates to a pencil, and particularly one which provides improvements in the construction of mechanical type pencils.

It is an object of this invention to provide a mechanical type pencil wherein an operating part of the lead-propelling mechanism affords the necessary frictional drag for said mechanism. v f

It is a furtherobject'of thisfinventionto provide a mechanical type pencil having an improved eraser-holding structure ass0cia facilitate the unscrew ng ted therewith. I

It is another object of 'this'i'nventionto provide a pencil embodying an improved lead magazine structure. 1 51 Itis an important object of thisflinvention to provide an improved type of mechanical pencil which is neat'niappearance, easily re-filled with lead, eflicient and convenient in] operation, durableand capable of being economically manufactured;

Other and further important objects of this invention willbe apparent from the disclosures in the specification and the accom- On the drawings: 7 P Fig. 1 is an elevation view ofa'pencilxembodying the principles of this invention. Fig. 2 i I with parts in elevation slightly enlarged taken through the pencil of this invention.

Fig. 3 is a View similar to Fig. 2 with the lead-propellingmechanism shown in section and the operating cap and closure structure in elevation. i i

- Fig. 4 isan enlarged fragmentary detail sectional view illustrating the attachment'of the lead-feeding tube to the rotatable-cap member.

' Fig. 5 is a slightly enlargeclsection onthe line 55, of Figure 2.

As shown on the drawings: The reference numeral 1 lndicates a usual pencil casing which may be formed of any suitable material, but which in the present instance, is preferably formed of hard rubber orsimilar material. Said casing 1' is provided w th a usual conical point 2 and is longitudinally recessed, having a passaged tip member 3 engaged in said recess, said member 3 being provided with a shoulder abutting the end of the casing 1 at the conical point 2, and being suitably split asindicated at 4 to resiliently engagea lead 5 extending therethrough in the usual manner.

"sure member 9, through thecasing 1, andabutting a shoulder 11 in the tipmemberB, is a leadfeeding and guidingtube '12. Axially movable said'tube 12 is a lead feeding plunger 13, which is providedat its inner end with a projecting member 1 1, which extends outtween the coils of a helical member 16 isa longitudinal central section 1924. Serial no. 703,590. 1

The tip member 3 has a tubular extension 6 extending through the passage in the conical flared outwardly as indicated at The end of the casing 1 opposite 9 which is 10 engaging the endof the casing 1 and projecting'slightly from the wall thereof to j I of the closure member 9. Rotatably mounted in said cloand extending axially slot in'said tube besurwardly through a rounding the tube inside-the pencil casing.

The outer end of said helical member 16 permanently secured to the closure member -9,"iso that-said helical member is normally non-rotatable, and the lower end of said helical member abuts a thrust washer or flange member 17 extending outwardly from the tube 12'andsecured thereto at a point -1ntermed iate its ends. The helical member '16 is preferably slightly compressed relative to its longitudinal axis, so that the frictional engagement of the end thereof with the flange member 17 affords a desired frictional drag tothe rotation of said tube. The ends of the slot15 in the tube 12 limit the movement of the member '14 toward and from the point of the pencil, a wire plug 18 perm'anently secured in the outer end of said tube 12, as shown in Figure 1, acts to-strengthen the end of the tube at the joint between the closure member 9 and a rotatable cap member 19, which "is rotatable on said closure member, and which is secured to said outer end ofthe tube 12. The recess 7 in the easing 1 is enlarged adjacent the helical member 16 to afford an enlarged recess 20,'there being a shoulder21 between, said recesses and 20, as clearly shown in Fig. 2. A maga- I zine for extra leads is provlded for by said to enclose the helical member 16, the outwardly extending ribbed portions 23 of which engage each other and also engage the inner wall of the casing 1 in the recess 20.

These stamped metal members 22 are assembled in the position shown in Fig. 5 and forced into the casing, being frictionally held therein by the engagement of the ribs 23 with the walls of the casing. The extra leads in position in the magazine rest on the shoulder 21 and are positioned in the magazine as indicated in Fig. 5, said extra leads being represented by the reference numeral 24. Leads may be inserted in the pencil either from the outside through the tip 3, or from the inside by dropping the same into the tube 6, or they may be dropped into the end of the tube 12 when the same is removed from the pencil, the end of said tube 12 being countersunk at 12 for this purpose.

This invention also provides an improved eraser structure which is associated with the rotatable cap member 19, and which acts to removably secure an eraser 25 thereto. For this purpose said cap member 19 is provided with an internally threaded recess at its outer end, which is adapted to receivea split exteriorly threaded bushing 26, in which the eraser 25 is mounted. Said eraser is mount-ed in an outwardly converging recess in said bushing, so that when the bushing is revolved in the cap 19 the eraser 1s firmly held in association therewith. A knurled flange 27 is formed on the bushin 26 to facilitate the engagement thereof with the cap member 19, the inner side of said flange resting on the end of'the cap member when the same is in operative position. It will be apparent from the foregoing description that this invention provides a mechanical pencil which is of exceedingly simple construction, and in which the leads may be Y readily replenished. \Vhen said leads are in position in the pencil, the rotation of the cap 19 of course causes an axial movement of the plunger 13, due to the engagement of the projecting member 1 1 on said plunger, with the helical member 16, which is held stationary by the closure member 9. To remove the mechanism from the pencil and to gain access to the extra lead magazine, it is only necessaryto unscrew said closure member 9, as will be evident.

Vorn erasers 25 may be easily replenished by removal of the split bushing 26 and the insertion of a new eraser therein from the inner end thereof. As previously explained, the slight compression which is given to the helical member 16 acts to afford the necessary frictional drag to the operation of the pencil. The magazine with a plurality of compartments affords a convenient means for keeping a supply of leads of different color, distinctive colors being placed in separate chambers.

point, a closure member removably secured in the other end of said casing,a tube rotatably engaged through said closure member and extending through the casing to the interior of theconical point, an operating cap secured to the tube and engaging said closure member, a helical member surrounding the tube and secured at one end to said closure member, a member secured to the tube movably engaging the other end of said helical member, a lead propelling plunger in the tube, and means on said plunger engaging the helical member so that rotation of the tube actuates the plunger.

2. In a pencil, a casing having a conical point, a closure member removably secured in the other end of said casing, a tube rotatably engaged through.said closure member and extending through the casing, and rotatably contacting the same in the interior of said conical point, an operating cap secured to the tube and engaging said closure member, a helical member surrounding the tube and secured at one end to said closure member, a member secured to the tube movably engaging the other end of said helical member, said member being so positioned as to slightly compress said helical member, a

lead propelling plunger in the tube, and

means on said plunger engaging the helical member so that rotation of the tubeactuates the plunger.

3. In a pencil, a casing, a lead-propelling mechanism rotatably mounted therein, and resilient helical means in the casing cooperating with said lead-propelling mechanism to propel the lead, said helical means being in engagement under compression with a portion of said lead-propelling mechanism, whereby to retard rotation of the mechanism.

4. In a pencil, a casing, a lead-propelling mechanism rotatably mounted therein, a helical member held against rotation within the casing, a lead-feeding plunger rotatable with said mechanism and lengthwise mova-- ble therein, coacting with the said helical member to propel the lead, said helical member being resilient and being under compression lengthwise between a portion of the casing and a portion of the lead-propelling mechanism whereby to retard rotation of the mechanism. r

In testimony whereof I have hereunto subscribed my name.

JULIUS SIVANBERG. 

